next.config.js

// You might need to insert additional domains in script-src if you are using external services

const ContentSecurityPolicy = `
  default-src 'self';
  script-src 'self' 'unsafe-eval' 'unsafe-inline' giscus.app analytics.umami.is;
  style-src 'self' 'unsafe-inline';
  img-src * blob: data:;
  media-src *.s3.amazonaws.com;
  connect-src *;
  font-src 'self';
  frame-src giscus.app
`

const securityHeaders = [
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
    {
        key: 'Content-Security-Policy',
        value: ContentSecurityPolicy.replace(/\n/g, ''),
    },
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
    {
        key: 'Referrer-Policy',
        value: 'strict-origin-when-cross-origin',
    },
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
    {
        key: 'X-Frame-Options',
        value: 'DENY',
    },
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
    {
        key: 'X-Content-Type-Options',
        value: 'nosniff',
    },
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control
    {
        key: 'X-DNS-Prefetch-Control',
        value: 'on',
    },
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
    {
        key: 'Strict-Transport-Security',
        value: 'max-age=31536000; includeSubDomains',
    },
    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy
    {
        key: 'Permissions-Policy',
        value: 'camera=(), microphone=(), geolocation=()',
    },
]

/**
 * @type {import('next/dist/next-server/server/config').NextConfig}
 **/
module.exports = () => {
    const plugins = [
        require('next-contentlayer').withContentlayer,
        require('@next/bundle-analyzer')({
            enabled: process.env.ANALYZE === 'true',
        }),
    ]
    return plugins.reduce((acc, next) => next(acc), {
        reactStrictMode: true,
        pageExtensions: ['ts', 'tsx', 'js', 'jsx', 'md', 'mdx'],
        eslint: {
            dirs: ['app', 'components', 'layouts', 'scripts'],
        },
        images: {
            domains: ['picsum.photos'],
        },
        async headers() {
            return [
                {
                    source: '/(.*)',
                    headers: securityHeaders,
                },
            ]
        },
        webpack: (config) => {
            config.module.rules.push({
                test: /\.svg$/,
                use: ['@svgr/webpack'],
            })

            return config
        },
    })
}